An astromech droid is one of a series of "versatile utility robots generally used for the maintenance and repair of starships and related technology".[13] These small droids usually possess "a variety of tool-tipped appendages that are stowed in recessed compartments".[13]R2-D2 is an astromech droid introduced in 1977's Star Wars and featured in all subsequent films.[14] The malfunctioning droid R5-D4 also makes a brief appearance in Star Wars.[15]U9-C4 is a timid droid sent on a mission with D-Squad, an all-droid special unit in Star Wars: The Clone Wars,[16]C1-10P is an oft-repaired, "outmoded" astromech who is one of the Star Wars Rebels regular characters,[17] and BB-8 is the astromech droid of X-wing fighter pilot Poe Dameron in The Force Awakens.[18]

A battle droid is a class of military robot used as an easily controlled alternative to human soldiers, most notably seen in the Star Wars prequel trilogy of films and the Star Wars: The Clone Wars TV series, in which 'B1' and 'B2' models are frequent antagonists. Due to their ubiquity, the terms 'B1' and 'battle droid' are used interchangeably; 'B2' models are also referred to as 'super' battle droids.[19][20]

The tall, thin B1 model resembles the Geonosian species, who designed the droids, and are known to "suffer programming glitches that manifest as personality quirks."[21] The droideka is a three-legged heavy infantry unit with twin blasters and the ability to generate a force shield and transform into a disk shape.[22] Multiple other types of specialized battle droids have been featured in the Star Wars fictional universe.[23]